Restore focus after altering inline widget

cc @njx - this is for #6767.

**Note** that we may not want to take this fix in this form, but it illustrates problem.

I trapped this issue by changing this code (InlineTextEditor.js line 182):

```
        if (this.editor) {
            this.editor.focus();
        }
```

to:

```
        if (this.editor) {
            this.editor._codeMirror.on("blur", function () {
                console.log("blurred...");   // put BREAKPOINT HERE
            });
            this.editor.focus();
        }
```

When you hit that breakpoint and look at the callstack at CodeMirror function updateDisplayInner(), you can see it's doing something similar, so this seems to be a known issue. Maybe that code needs to be fixed?